Ammonia-gas compressor.



PATENT ornron UNITED STATES WILL P. STEVENS, OF nos ANGELES, CALIFORNIA. AMMONIA-GAS COMPRESSOR;

citizen of the UnitedStates, residing at 'Los 'the'following is a specification.

I the novel Angeles, in the county of Los Angeles and State of Oalifornia,have invented a new and useful Ammonia-Gas Compressor, of which This invention relates to ammonia-gascom ressors for refrigerating plants.

The object of. the invention is, in a ready, ositive' manner, to insure at a 1 times a full 0 arge of thoroughlyfeasible, ractical, and

gas to the pump-cylinder even though the suction-valve fails to work;-'to obviate liability-of damage to the pump-cylinder in the event of failure of the discharge-valve to work, as from binding or sticking in its seat, or from any other cause which will render it non-yielding; to. efl'ect compression ofthe gas in a rapid and economical manner, and

generally to improve and render more effect-H.

ive the operation of compressors of the class defined.

With theabove and other objects in view,

as will appear as the nature of the invention is better understood 'the same consists inarts of an ammonia-gas compressor, as will be hereinafter fully described and claimed.

In the accompanying drawings, forming a part of this specification, and in which like characters of reference indicate corresponding parts, there is illustrated one form of em bodlment of the invention capable of carrying the same into practical operation, it bein understood that the elements therein exhi ited may bevaried or changed as-to shape, pro ortion, and exactmanner'of assemblage wit out-departing from the spirit thereof.

In the drawings, Figure 1 is a'view in side elevation of a compressor embodying the im.- provements of the present invention. Fig. 2 is a sectional detail view, on. an enlarged scale, of the upper portion of the compressor.

Referring to the drawings, 1 designates a pedestal upon which is supported in the usual or any preferred manner a pump-cylinder 2, the lower part of the pedestal being provided with bearings 3 for supporting a drive-wheel 4 of the usual construction.

The pump-cylinder has arranged in it a hollow piston 5, with which connects the upper end of a piston-rod 6, the lower end of which is operatively connected with the crank OfJJhG drive-wheel, thereby to effect recipi'ocatory movements of the piston. The

Specification of Letters Patent. Application filed April 4. 1904.. satin lie- 201.548.

l is the stem 10 of the'suction-valve construction and combination of piston Patented Dec. as, 1906.

an adjustable gland 8, by which to insure a gas-ti ht passage-way forth'e-piston-rod.

' Com ined with the piston is 8. ca e 8, which has a screw connection at 9 wit the piston, and working in the bore infthis cage 11, which engages a seat in the upper face of the cage, the lower end of the stem having combined with it a head 12, which works in a seat 13 in the cage, the head bein held in operative relation with re ard to the stem bya nut 14. The bore of t ateof its ends to receive a coiled spring 15, which bears at its lower end against the head, and thus serves to hold the valve llvyieldinglyseatedy l One-of the essential features of the present invention is the rovision of means toeffect supply-of a full c arge of gas to the gas-compressing chamber or that portion of the pump-cylinder above the piston, thereby to prevent any interferencewiththe operation of the compressor. This function is secured me iateof its ends with a circumferential chamber 16, constitutin chamber, and with whic emer encychamberand the as-compressing cham er being established t dium of a plurality of ports 18, which, as

clearly shown, are in alinement with the up per face of the piston when the latter is at the limit of its downward stroke. The past piston-rod works in a stufling-box 7, having roviding the wall ofthe cylinder inter-' an emergency gas-' communicates thesuct1on-p1pe 17, communication between the e cage is enlarged intermediough the mesage of the gas from the gas-receiving cham-' ber19, or at portion of the pump-cylinder below the piston to the emergency gaschamber is secured to a by-pass 20.

It will benoted. by referring particularly to Fig. 2 that the circumferential chamber 16' is of substantially the same cross-sectional area as the suction-pipe 17, so that little if any expansion of the gas will occur within said chamber prior to its dischar e through the opening 18. It is also to e noted that this chamber 16 only surrounds the base of the cylinder and that that ortion ofthe cylinder thereabo've and in'which the works is maintained at a uniform temperature throughout its extent, and there is therefore no danger of the cylinder being expanded or contracted unevenly, so as to. be shifted out of true. and interfere with the op eration of the iston' The means or relieving the pump-cylin- 1o shimk 28 of a guide 29,

z 5 with the cylinder above 60 compressors der from danger of looking or binding consists of a head sea-e81 injury in the event of the of the discharge-valve 21 22', which is held against a seat 23, formed in the upper portion of the cylinder by a spring 5 which bears against 24, the upper end the cylinder-head 25 and the lower end against the base-flange 26 of a cage 27.

' The inner upperportion of the cage is threaded to receive the threaded jects the upper end' of the valve 21, thelower through which prostem 30' of the portion of the stem being provided with ahead 31 to work in the lower ertion of the gende a spring 32 interp etween the under-face of the Vt1$h$ 31 serving to yieleingly seated osed ide and the hod the valve Thegas-eempressin chamber of the pumpcylinderis surreundedhy a water-jacket 33, 20 as usual with the lower portion of which connects a water-inlet pipe 34 and with the portion a water-outlet pipe 35, the

' i unipeylinder being alsoprovided with the uses ischarge pipe 36,

which communicates the head 23.

The operation of the compressor is as follower-0n the" upstroke of the piston gas is drawn in through the suction -pipe 17 andentelis the gas-receiving chamber 19, and on o the downBtroke ofthe piston' the piston and through the cage and theo'u lifts t esuction-valve, and the' gas -compressing chamb the gas-passes us escapes to er When the rushes into the compression chamber, it

of course contacts and is expanded.- ten reaches the limit. eiiipeses'theperts 1'8, of cold gas Will= rush 4o cempressin expanded gastherein, increasing the capacity Should the valve 11 bindin with the hot walls thereof When, however, the pis-- of its downstroke' and an additional quantity therethrough into the hamber and will condense the and this will result in of the machine.-

its seat or from any other cause refuse towork, upon the downstrolre of the chamber 19' will be pass 20inte the emergency and. thence tllreugh istom the gasinthe' oreed' throu h the by gas-c amber 16 the ports=18intothegas compressing chamber, so that when the pietom takesits upstroke itwill have a charge ofgas to propel.-

If" upon the upstroke of the iston the discharge-valve 21 refuses .to'

act om any cause,

ports 37 into the uppe the gas-pressure will hit the'headlandipemnit theescape of r part of t ecylinder and thence-to the discharge-p as through ipe 36.-

The improvements herem= described are practicaily and thoroughly eflicient for the purposes designed and may be adopted with iextensive or structural arrangement.

Having thusfully describe what I claim is ofstandard makes wit obiectionable change their rl my invention,

out any a 1. In a gas-compressor, a compressor-piston having an upwardly-opening valve, a gas-compressing chamber, a gas-receivin chamber, a suction-pipe, a circumferentia compartment upon the gas-receiving [compartment and of substantially transverse area as the suction pipe, said com- ,partment being disposed entirely below and commumcating with the gas-compressing compartment, and a water-jacket entirely surrounding the compressing-chamber;

2, In a machineof the character described the same the combination with a cylinder having a gas-receiving chamber in the base thereof and a gas-compressing ferential enlargement 1113011} the base of the cylinder, and around the gas-receiving compartment, sai'l enlargement having a cir-' cumferential compartment communicating through the portswith the lower end of the gas-compressing chamber and, through a bypass with the gas-receiving chamber, a suction-pipe opening into the circumferential compartment adjacent one end ofthe bypass, a piston adapted to work inthe gascom'pressing chamber and to travelinto the gas-receivingchamber asufiicient distance to uncover the ports, said iston having a assage therethrough, a spring for control 'ng the passage of gas throughthe piston, 21. spring-pressed valve disposed in one endof the cylinder, and a water-jacket completely surrounding, the gas-compressing chamber. 3. In a machine ofthe character described a hollow pistonopen at one'end and countersunk to form a seat, the other end of said piston being tapered and having apertures communicating with the. interior thereof, saidpiston being thread-ed internal-ly, a hollow cage threaded into' annular flange upon theseat, said cage hair ing apertures for establishing communication between theinteriors'of the iston' and head, a reduced extension integrah cage and disposed therein, saidextension being. hollow, a-valve normally closing one end of the cage, a stem pro'ectingtherefrom and slid'ahb mounted wit in the reduced extension, a spring withinsaid extension and holding the valve. the stem and movably mounted withinthe extension for tensioning the spring, saidit i my own I have hereto afiixed my signature" inthe presence of two witnesses.

WILL P; STEVENS Witnesses-z JOHN Pnom, J nsse M. Alanna-nun.

the piston and having amwith the between the aperturesaround the stemfor I seated, and means upon means serving to center the stem w n the extension. I Imtestimeny that I claim theferegoing' as '120 

